Turn on logger output by default
Turn on logger output by default

Crash output is needed to properly debug Celluloid. It does make running
the test suite pretty noisy though. There's crashes going on on Travis
that I can't debug right now because I don't have the log.

Perhaps the test runner could output the crashes to a logfile instead

jasonm23/celluloid,kenichi/celluloid,jstoja/celluloid,davydovanton/celluloid,marshall-lee/celluloid,celluloid/celluloid,sideci-sample/sideci-sample-celluloid,olleolleolle/celluloid,tarcieri/celluloid,TiagoCardoso1983/celluloid,mehta/celluloid,seuros/celluloid,dilumn/celluloid